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  <h1>Source code for geoslurp.tools.gravity</h1><div class="highlight"><pre>
<span></span><span class="c1"># This file is part of geoslurp.</span>
<span class="c1"># geoslurp is free software; you can redistribute it and/or</span>
<span class="c1"># modify it under the terms of the GNU Lesser General Public</span>
<span class="c1"># License as published by the Free Software Foundation; either</span>
<span class="c1"># version 3 of the License, or (at your option) any later version.</span>

<span class="c1"># geoslurp is distributed in the hope that it will be useful,</span>
<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<span class="c1"># Lesser General Public License for more details.</span>

<span class="c1"># You should have received a copy of the GNU Lesser General Public</span>
<span class="c1"># License along with geoslurp; if not, write to the Free Software</span>
<span class="c1"># Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA</span>

<span class="c1"># Author Roelof Rietbroek (roelof@geod.uni-bonn.de), 2018</span>

<span class="kn">from</span> <span class="nn">sqlalchemy.ext.declarative</span> <span class="k">import</span> <span class="n">declared_attr</span><span class="p">,</span> <span class="n">as_declarative</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">MetaData</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">Column</span><span class="p">,</span><span class="n">Integer</span><span class="p">,</span><span class="n">String</span><span class="p">,</span> <span class="n">Boolean</span><span class="p">,</span><span class="n">Float</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.dialects.postgresql</span> <span class="k">import</span> <span class="n">TIMESTAMP</span><span class="p">,</span> <span class="n">JSONB</span>
<span class="kn">import</span> <span class="nn">gzip</span> <span class="k">as</span> <span class="nn">gz</span>
<span class="kn">from</span> <span class="nn">geoslurp.config.slurplogger</span> <span class="k">import</span> <span class="n">slurplogger</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">datetime</span>
<span class="kn">from</span> <span class="nn">enum</span> <span class="k">import</span> <span class="n">Enum</span>

<span class="c1">#define a declarative baseclass for spherical harmonics gravity  data</span>
<span class="nd">@as_declarative</span><span class="p">(</span><span class="n">metadata</span><span class="o">=</span><span class="n">MetaData</span><span class="p">(</span><span class="n">schema</span><span class="o">=</span><span class="s1">&#39;gravity&#39;</span><span class="p">))</span>
<span class="k">class</span> <span class="nc">GravitySHTBase</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="nd">@declared_attr</span>
    <span class="k">def</span> <span class="nf">__tablename__</span><span class="p">(</span><span class="bp">cls</span><span class="p">):</span>
        <span class="c1">#strip of the &#39;Table&#39; from the class name</span>
        <span class="k">return</span> <span class="bp">cls</span><span class="o">.</span><span class="vm">__name__</span><span class="p">[:</span><span class="o">-</span><span class="mi">5</span><span class="p">]</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
    <span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
    <span class="n">lastupdate</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">TIMESTAMP</span><span class="p">)</span>
    <span class="n">tstart</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">TIMESTAMP</span><span class="p">,</span><span class="n">index</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
    <span class="n">tend</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">TIMESTAMP</span><span class="p">,</span><span class="n">index</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
    <span class="n">time</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">TIMESTAMP</span><span class="p">,</span><span class="n">index</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
    <span class="n">nmax</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">)</span>
    <span class="n">omax</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">)</span>
    <span class="n">gm</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">Float</span><span class="p">)</span>
    <span class="n">re</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">Float</span><span class="p">)</span>
    <span class="n">tidesystem</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
    <span class="n">origin</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
    <span class="nb">format</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
    <span class="nb">type</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
    <span class="n">uri</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
    <span class="n">data</span><span class="o">=</span><span class="n">Column</span><span class="p">(</span><span class="n">JSONB</span><span class="p">)</span>

<div class="viewcode-block" id="icgemMetaExtractor"><a class="viewcode-back" href="../../../reference/geoslurp.tools.html#geoslurp.tools.gravity.icgemMetaExtractor">[docs]</a><span class="k">def</span> <span class="nf">icgemMetaExtractor</span><span class="p">(</span><span class="n">uri</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Extract meta information from a gzipped icgem file&quot;&quot;&quot;</span>

    <span class="c1">#first extract the icgem header</span>
    <span class="n">headstart</span><span class="o">=</span><span class="kc">False</span>
    <span class="n">hdr</span><span class="o">=</span><span class="p">{}</span>
    <span class="k">with</span> <span class="n">gz</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">uri</span><span class="o">.</span><span class="n">url</span><span class="p">,</span><span class="s1">&#39;rt&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">fid</span><span class="p">:</span>
        <span class="n">slurplogger</span><span class="p">()</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Extracting info from </span><span class="si">%s</span><span class="s2">&quot;</span><span class="o">%</span><span class="p">(</span><span class="n">uri</span><span class="o">.</span><span class="n">url</span><span class="p">))</span>
        <span class="k">for</span> <span class="n">ln</span> <span class="ow">in</span> <span class="n">fid</span><span class="p">:</span>
            <span class="c1"># if &quot;begin_of_head&quot; in ln:</span>
            <span class="c1">#     headstart=True</span>
            <span class="c1">#     continue</span>

            <span class="k">if</span> <span class="n">headstart</span> <span class="ow">and</span> <span class="s1">&#39;end_of_head&#39;</span> <span class="ow">in</span> <span class="n">ln</span><span class="p">:</span>
                <span class="k">break</span>

            <span class="c1"># if headstart:</span>
            <span class="n">spl</span><span class="o">=</span><span class="n">ln</span><span class="o">.</span><span class="n">split</span><span class="p">()</span>
            <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">spl</span><span class="p">)</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
                <span class="n">hdr</span><span class="p">[</span><span class="n">spl</span><span class="p">[</span><span class="mi">0</span><span class="p">]]</span><span class="o">=</span><span class="n">spl</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>


    <span class="k">try</span><span class="p">:</span>
        <span class="n">meta</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;nmax&quot;</span><span class="p">:</span><span class="nb">int</span><span class="p">(</span><span class="n">hdr</span><span class="p">[</span><span class="s2">&quot;max_degree&quot;</span><span class="p">]),</span>
          <span class="s2">&quot;lastupdate&quot;</span><span class="p">:</span><span class="n">uri</span><span class="o">.</span><span class="n">lastmod</span><span class="p">,</span>
          <span class="s2">&quot;format&quot;</span><span class="p">:</span><span class="s2">&quot;icgem&quot;</span><span class="p">,</span>
          <span class="s2">&quot;gm&quot;</span><span class="p">:</span><span class="nb">float</span><span class="p">(</span><span class="n">hdr</span><span class="p">[</span><span class="s2">&quot;earth_gravity_constant&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s1">&#39;D&#39;</span><span class="p">,</span><span class="s1">&#39;E&#39;</span><span class="p">)),</span>
          <span class="s2">&quot;re&quot;</span><span class="p">:</span><span class="nb">float</span><span class="p">(</span><span class="n">hdr</span><span class="p">[</span><span class="s2">&quot;radius&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s1">&#39;D&#39;</span><span class="p">,</span><span class="s1">&#39;E&#39;</span><span class="p">)),</span>
          <span class="s2">&quot;uri&quot;</span><span class="p">:</span><span class="n">uri</span><span class="o">.</span><span class="n">url</span><span class="p">,</span>
          <span class="s2">&quot;type&quot;</span><span class="p">:</span><span class="s2">&quot;GSM&quot;</span><span class="p">,</span>
          <span class="s2">&quot;data&quot;</span><span class="p">:{</span><span class="s2">&quot;name&quot;</span><span class="p">:</span><span class="n">hdr</span><span class="p">[</span><span class="s2">&quot;modelname&quot;</span><span class="p">]}</span>
          <span class="p">}</span>
    <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
        <span class="k">pass</span>

    <span class="c1">#add tide system</span>
    <span class="k">try</span><span class="p">:</span>
        <span class="n">tmp</span><span class="o">=</span><span class="n">hdr</span><span class="p">[</span><span class="s2">&quot;tide_system&quot;</span><span class="p">]</span>
        <span class="k">if</span> <span class="n">re</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s1">&#39;zero_tide&#39;</span><span class="p">,</span><span class="n">tmp</span><span class="p">):</span>
            <span class="n">meta</span><span class="p">[</span><span class="s2">&quot;tidesystem&quot;</span><span class="p">]</span><span class="o">=</span><span class="s2">&quot;zero-tide&quot;</span>
        <span class="k">elif</span> <span class="n">re</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="s1">&#39;tide_free&#39;</span><span class="p">,</span><span class="n">tmp</span><span class="p">):</span>
            <span class="n">meta</span><span class="p">[</span><span class="s2">&quot;tidesystem&quot;</span><span class="p">]</span><span class="o">=</span><span class="s2">&quot;tide-free&quot;</span>
    <span class="k">except</span><span class="p">:</span>
        <span class="k">pass</span>

    <span class="k">return</span> <span class="n">meta</span></div>


<div class="viewcode-block" id="Trig"><a class="viewcode-back" href="../../../reference/geoslurp.tools.html#geoslurp.tools.gravity.Trig">[docs]</a><span class="k">class</span> <span class="nc">Trig</span><span class="p">():</span>
    <span class="sd">&quot;&quot;&quot;Enum to distinguish between a trigonometric cosine and sine coefficient&quot;&quot;&quot;</span>
    <span class="n">c</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="n">s</span> <span class="o">=</span> <span class="mi">1</span></div>

<div class="viewcode-block" id="JSONSHArchive"><a class="viewcode-back" href="../../../reference/geoslurp.tools.html#geoslurp.tools.gravity.JSONSHArchive">[docs]</a><span class="k">class</span> <span class="nc">JSONSHArchive</span><span class="p">():</span>
    <span class="sd">&quot;&quot;&quot;JSON Archive which stores SH data, with sigmas and possibly a covariance</span>
<span class="sd">    Note this mimics the Archive interface of frommle without actually requiring its import&quot;&quot;&quot;</span>
    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">nmax</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span><span class="n">datadict</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        
        <span class="k">if</span> <span class="n">nmax</span><span class="p">:</span>
            <span class="c1">#create from maximum degree</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;attr&quot;</span><span class="p">:{},</span><span class="s2">&quot;vars&quot;</span><span class="p">:{</span><span class="s2">&quot;shg&quot;</span><span class="p">:[]}}</span>
            <span class="n">shg</span><span class="o">=</span><span class="p">[]</span>
            <span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">nmax</span><span class="o">+</span><span class="mi">1</span><span class="p">):</span>
                <span class="k">for</span> <span class="n">m</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">n</span><span class="o">+</span><span class="mi">1</span><span class="p">):</span>
                    <span class="n">shg</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">n</span><span class="p">,</span><span class="n">m</span><span class="p">,</span><span class="n">Trig</span><span class="o">.</span><span class="n">c</span><span class="p">))</span>
                    <span class="k">if</span> <span class="n">m</span><span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
                        <span class="n">shg</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">n</span><span class="p">,</span><span class="n">m</span><span class="p">,</span><span class="n">Trig</span><span class="o">.</span><span class="n">s</span><span class="p">))</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="s2">&quot;shg&quot;</span><span class="p">]</span><span class="o">=</span><span class="n">shg</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;attr&quot;</span><span class="p">][</span><span class="s2">&quot;nmax&quot;</span><span class="p">]</span><span class="o">=</span><span class="n">nmax</span>
        <span class="k">elif</span> <span class="ow">not</span> <span class="n">nmax</span> <span class="ow">and</span> <span class="n">datadict</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="o">=</span><span class="n">datadic</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="k">raise</span> <span class="n">RunTimeError</span><span class="p">(</span><span class="s2">&quot;Can only construct a JSONSHArchive from either nmax or a datadict&quot;</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">key</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;retrieves a named variable, and lazily creates allowed variables when requested&quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">key</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">]:</span>
            <span class="k">if</span> <span class="n">key</span> <span class="ow">in</span> <span class="p">[</span><span class="s2">&quot;cnm&quot;</span><span class="p">,</span><span class="s2">&quot;sigcnm&quot;</span><span class="p">]:</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="n">key</span><span class="p">]</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">*</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="s2">&quot;shg&quot;</span><span class="p">])</span>
            <span class="k">elif</span> <span class="n">key</span> <span class="o">==</span> <span class="s2">&quot;covcnm&quot;</span><span class="p">:</span>
                <span class="n">nl</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="s2">&quot;shg&quot;</span><span class="p">])</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="n">key</span><span class="p">]</span><span class="o">=</span><span class="p">[[</span><span class="mi">0</span><span class="p">]</span><span class="o">*</span><span class="n">nl</span><span class="p">]</span><span class="o">*</span><span class="n">nl</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="n">key</span><span class="p">]</span>
    
    <span class="k">def</span> <span class="nf">__setitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">key</span><span class="p">,</span><span class="n">item</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="n">key</span><span class="p">]</span><span class="o">=</span><span class="n">item</span>


<div class="viewcode-block" id="JSONSHArchive.idx"><a class="viewcode-back" href="../../../reference/geoslurp.tools.html#geoslurp.tools.gravity.JSONSHArchive.idx">[docs]</a>    <span class="k">def</span> <span class="nf">idx</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">nmt</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;returns the index of the n,m,t tuple&quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;vars&quot;</span><span class="p">][</span><span class="s2">&quot;shg&quot;</span><span class="p">]</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">nmt</span><span class="p">)</span></div>

    <span class="nd">@property</span>
    <span class="k">def</span> <span class="nf">attr</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;get the stored global attributes of the file&quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;attr&quot;</span><span class="p">]</span>

    <span class="nd">@attr</span><span class="o">.</span><span class="n">setter</span>
    <span class="k">def</span> <span class="nf">attr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">attrdict</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;sets the stored global attributes of the file&quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">data_</span><span class="p">[</span><span class="s2">&quot;attr&quot;</span><span class="p">]</span><span class="o">=</span><span class="n">attrdict</span>
    
    <span class="nd">@property</span>    
    <span class="k">def</span> <span class="nf">dict</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">data_</span></div>
    
</pre></div>

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